A co-worker once spend considerable time on a paper for a meteorological journal, reviewing it, and making copious suggestions to improve the content of the paper he was rejecting. He sent it back to the editor, and it was duly rejected.

Fast forward a year or so later, he is contacted by a mathematician on campus who has received the identical article for review -- without even the suggested changes -- for a math journal. It was pure chance that the mathematician contacted my co-worker; I wonder what would have happened if he had not?